WASHINGTON — Their fathers led the nation in the early years amid the struggle by black America for civil rights — and both Lynda Bird Johnson Robb and Caroline Kennedy see much work still to be done.

At the 50th anniversary ceremony of the March on Washington, Robb appealed for continued progress. She remembered the words of Coretta Scott King, telling the crowd that, "Freedom is never really won. You earn it and win it in every generation."